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kvm: fix memory leak on failure to read stats descriptors 

Reported by Coverity as CID 1490142.  Since the size is constant and the
lifetime is the same as the StatsDescriptors struct, embed the struct
directly instead of using a separate allocation.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-09-05 12:06:02 +02:00
parent 958e1dd130
commit 21adec30f6
1 changed files with 4 additions and 5 deletions
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9
accel/kvm/kvm-all.c
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@ -3908,7 +3908,7 @@ exit:
typedef struct StatsDescriptors {
const char *ident; /* cache key, currently the StatsTarget */
struct kvm_stats_desc *kvm_stats_desc;
struct kvm_stats_header *kvm_stats_header;
struct kvm_stats_header kvm_stats_header;
QTAILQ_ENTRY(StatsDescriptors) next;
} StatsDescriptors;
@ -3939,7 +3939,7 @@ static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd
descriptors = g_new0(StatsDescriptors, 1);
/* Read stats header */
kvm_stats_header = g_malloc(sizeof(*kvm_stats_header));
kvm_stats_header = &descriptors->kvm_stats_header;
ret = read(stats_fd, kvm_stats_header, sizeof(*kvm_stats_header));
if (ret != sizeof(*kvm_stats_header)) {
error_setg(errp, "KVM stats: failed to read stats header: "
@ -3964,7 +3964,6 @@ static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd
g_free(kvm_stats_desc);
return NULL;
}
descriptors->kvm_stats_header = kvm_stats_header;
descriptors->kvm_stats_desc = kvm_stats_desc;
descriptors->ident = ident;
QTAILQ_INSERT_TAIL(&stats_descriptors, descriptors, next);
@ -3989,7 +3988,7 @@ static void query_stats(StatsResultList **result, StatsTarget target,
return;
}
kvm_stats_header = descriptors->kvm_stats_header;
kvm_stats_header = &descriptors->kvm_stats_header;
kvm_stats_desc = descriptors->kvm_stats_desc;
size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size;
@ -4054,7 +4053,7 @@ static void query_stats_schema(StatsSchemaList **result, StatsTarget target,
return;
}
kvm_stats_header = descriptors->kvm_stats_header;
kvm_stats_header = &descriptors->kvm_stats_header;
kvm_stats_desc = descriptors->kvm_stats_desc;
size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size;